A177608 - OEIS

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A177608

Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, down

1, 20, 1586, 315125, 126303569, 89413719314, 102170147565708, 176499204309919562

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A160308 A177625 A203481 * A177610 A130040 A331563

Adjacent sequences: A177605 A177606 A177607 * A177609 A177610 A177611

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved